Post-driver



4 2 Sheet-Sheet 2.

(No Model.) I.

J. MOLANDSBOROUGH.

. POST DRIVER. No. 448,140. Patented Mar. 10, 1891.

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SPECIFICATION forming part of Letters Patent No. 448,140, dated March 10, 1891.

Application filed November 13, 1890. Serial No. 371,308. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH McLANDsBoR- OUGH, a citizen of the United States, residing at Station Fifteen, in the county of Harrison and State of Ohio, have invented certain new and useful Improvements in Post-Drivers; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to post-drivers, and aims to improve the general construction of the same, whereby their efficiency and usefulness is increased to an eminent degree.

The improvement consists of the novel features and the peculiar construction and combination of the parts, which will be hereinafter more fully described and claimed, and which are shown in the annexed drawings, in which Figure 1 is a perspective view of a machine embodying my invention. Fig. 2 is a sectional side view showing the manner of plumbing the derrick. Fig. 3 is a detail view showing the manner of tripping the hammer.

The base of the derrick is composed of the two side sills A A, which have openings to a near each end and suitable tie-bars B B. Two frames 0 0 rise from the base and are strengthened by the lateral braces D D. The top bars E E of these frames 0 Care provided in their upper side with a series of notches e e. The derrick F is pivoted at its lower end to the base, and is adapted to swing between the frames 0 0, being held at the required position by the bail G, which is pivotally connected with the derrick and has its closed end g adapted to engage with corresponding notches e e in the bars E E. The hooks or catches g g on the closed end g are adapted to engage with the under side of the bars E E and hold the bail G in engagement with the notches c e,in which the closed end 9 may be inserted. The Windlass H is journaled on the end bars of the frames 0 O, and is held from retrograde movement by the pawl h. The operating-rope I, secured at one end to the Windlass and adapted to be wound there on, passes over pulley f at the top of the derrick and is weighted at-its free end, which end is provided with catch 13. The catch d is located below the weight f, and is attached to the rope between its ends. The releasingcord J, attached to the longer arm of catch 2' at one end, is made fast at its opposite end to Windlass H, on which it winds as cord I unwinds, and vice versa.

The supplemental sides K K, on which the whole structure is mounted, is held to the sills A A by the standards 7c, which pass through the openings a a in the sills A A. The standards 70 are notched and the latchbolts L engage with the notches. in the said standards L and hold the sills A and K in a fixed relative position after adjustment has been effected. The notched latch -bars M, pivoted to the sills K K, are adapted to engage with hooks m on the sills A A and hold the structure down on the sills K K. The set-screws N, located midway of the beams A A, are threaded in the said beams, and are adapted to bear on the sills K K. By turning the screws N down the structure can be raised or lowered to plumb the derrick.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination, with the derrick and the base, of the supplemental sills and the notched latch-bars for holding the base down on the sills, substantially as set forth.

2. The combination, with the derrick and the base, of the supplemental sills, the notched standards, the latch-bolts, and the set-screws, substantially as described.

3. The combination, with the base having frames, as O O, the upper bars of which are notched, of the derrick having pivotal con nection with the base, the bail connected with the derrick and adapted to engage with the notched bars and catches for holding the bail in engagement with the said notched bars, substantially as set forth.

4. A post-driver comprising the instrumen talities hereinbefore shown and described, composed of a base having notched bars E E, supplemental sills, the notched standards projected up from the sills, the latch-bolts L to engage with the said standards, the notched latch-bars M to hold the base down, the setscrews N for vertically adjusting the base on the sills, the derrick pivoted to the base and In testimony whereof Iaffix mysignaturein adjustable to and from the perpendicular, the presence of two Witnesses. bail G, connected with the derrick and adj ustable onthe notched bars E E, catches g JOSEPH MCLANDSBOROUGH. 5 to hold the bail G in engagement with the notched bars E E, and the hammer and means \Vitnesses: for operating the hammer, substantially as J. H. HERRON, described. V. S. MOOLAIN. 

